NDS Games

[Apples]

Give Radiant Historia a try, if you're into RPGs

Great game.
So do try what Fyrus said.

Also:
Nine Hours, Nine Persons, Nine Doors (if you are into puzzle and story)
Big Bang Mini (Just pure fun and cute, nothing serious)
Meteos (another puzzle game but this one is a block puzzle, amazing adorable in an odd way)

I can name a lot more, gotta finish up my work though~ but What kind of games are you into?